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Network Analyzer (AC Power)
From 1929 to the late 1960s, large alternating current power systems were modelled and studied on AC network analyzers (also called alternating current network calculators or AC calculating boards) or transient network analyzers. These special-purpose analog computers were an outgrowth of the DC calculating boards used in the very earliest power system analysis. By the middle of the 1950s, fifty network analyzers were in operation. AC network analyzers were much used for power-flow studies, short circuit calculations, and system stability studies, but were ultimately replaced by numerical solutions running on digital computers. While the analyzers could provide real-time simulation of events, with no concerns about numeric stability of algorithms, the analyzers were costly, inflexible, and limited in the number of buses and lines that could be simulated. Eventually powerful digital computers replaced analog network analyzers for practical calculations, but analog physical models ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Alternating Current
Alternating current (AC) is an electric current that periodically reverses direction and changes its magnitude continuously with time, in contrast to direct current (DC), which flows only in one direction. Alternating current is the form in which electric power is delivered to businesses and residences, and it is the form of electrical energy that consumers typically use when they plug kitchen appliances, televisions, Fan (machine), fans and electric lamps into a wall socket. The abbreviations ''AC'' and ''DC'' are often used to mean simply ''alternating'' and ''direct'', respectively, as when they modify ''Electric current, current'' or ''voltage''. The usual waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period corresponds with positive direction of the current and vice versa (the full period is called a ''wave cycle, cycle''). "Alternating current" most commonly refers to power distribution, but a wide range of other appl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
American Gas And Electric Company
American Electric Power Company, Inc. (AEP), (railcar reporting mark: AEPX) is an American domestic electric utility company in the United States. It is one of the largest electric utility companies in the country, with more than five million customers in 11 states. American Electric Power Company is one of the nation's largest generators of electricity, owning nearly 38,000 megawatts of generating capacity in the U.S. AEP also owns the nation's largest electricity transmission system, a nearly network that includes 765 kilovolt ultra-high voltage transmission lines, more than all other U.S. transmission systems combined. AEP's transmission system directly or indirectly provides about 10 percent of the electricity demand in the Eastern Interconnection, the interconnected transmission system that covers 38 eastern and central U.S. states and eastern Canada, and approximately 11 percent of the electricity demand in the Electric Reliability Council of Texas, the t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Ontario Hydro
Ontario Hydro, established in 1906 as the Hydro-Electric Power Commission of Ontario, was a publicly owned electricity utility in the Province of Ontario. It was formed to build transmission lines to supply municipal utilities with electricity generated by private companies already operating at Niagara Falls, Ontario, Niagara Falls, and soon developed its own generation resources by buying private generation stations and becoming a major designer and builder of new stations. As most of the readily developed hydroelectricity, hydroelectric sites became exploited, the corporation expanded into building coal-fired generation and then nuclear power, nuclear-powered facilities. Renamed as "Ontario Hydro" in 1974, by the 1990s it had become one of the largest, fully integrated electricity corporations in North America. Origins The notion of generating electric power on the Niagara River was first entertained in 1888, when the Niagara Parks Commission solicited proposals for the constru ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Potomac Electric Power Company
The Potomac Electric Power Company (PEPCO) is an American public utility, utility company that supplies electric power to the city of Washington, D.C., and to surrounding communities in Maryland. It is owned by Exelon. The company's current trademarked slogan is "Your life. Plugged in." Its former slogan was "We're connected to you by more than power lines." Pepco's bulk transmission system consists of transmission lines operating at 115 kV, 138kV, 230 kV and 500 kV. Pepco has interconnections with Potomac Edison (230kV, 500kV), Baltimore Gas and Electric (500kV, 230kV, 115kV), and Dominion Virginia Power (500kV, 230kV). History The company's predecessor, Potomac Electric Co., was organized in 1891 to provide street lighting and streetcar power in Georgetown and Northwest D.C. After suffering during the Panic of 1893, the company filed bankruptcy and, on November 6, 1895, was acquired by Oscar T. Crosby and Charles A. Lieb for $5,500. The company was incorporated as Potomac E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
São Paulo Tramway, Light And Power Company
São Paulo Tramway, Light and Power Company, also known as Light São Paulo or simply Light (), was a privately owned utility company operating in São Paulo, Brazil from 1899 until 1981. History Canadians William Mackenzie and Frederick Stark Pearson founded the São Paulo Tramway, Light and Power Company in 1899. In 1900 Light São Paulo began operating the first tram line in the city of São Paulo which ran to Barra Funda. Work began in 1901 on the hydroelectric plant in Santana de Parnaíba. It opened in 1905. In 1905 the company installed the first electric street lights on Rua Barão de Itapetininga. In 1906 the company constructed a reservoir at Guarapiranga. In 1907 they installed 50 more lights on Direita Street, Rua 15 de Novembro, and Rua São Bento. The company signed a contract with the state of São Paulo for the first time in 1911. By 1916 they had installed 8,605 gas lights and 864 electric street lamps in the city. In 1927 the company won a governm ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Bonneville Power Administration
The Bonneville Power Administration (BPA) is an American federal agency operating in the Pacific Northwest. BPA was created by an act of United States Congress, Congress in 1937 to market electric power from the Bonneville Dam located on the Columbia River and to construct facilities necessary to transmit that power. Congress has since designated Bonneville to be the marketing agent for power from all of the federally owned hydroelectric projects in the Pacific Northwest. Bonneville is one of four regional Federal Power Marketing Administration, power marketing agencies within the United States Department of Energy, U.S. Department of Energy (DOE). Operations The power generated on BPA's grid is sold to public utilities, private utilities, and industry on the grid. The excess is sold to other grids in Canada, California and other regions. Because BPA is a public entity, it does not make a profit on power sales or from providing transmission services. BPA also coordinates ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Commonwealth Edison Company
Commonwealth Edison, commonly known by syllabic abbreviation as ComEd, is the largest electric utility in Illinois, and the primary electric provider in Chicago and much of Northern Illinois. Its service territory stretches roughly from Iroquois County on the south to the Wisconsin border on the north and from the Iowa border on the west to the Indiana border on the east. For more than 100 years, Commonwealth Edison has been the primary electric delivery services company for Northern Illinois. Today, ComEd is a unit of Chicago-based Exelon Corporation, one of the nation's largest electric and gas utility holding companies. ComEd provides electric service to more than 3.8 million customers across Northern Illinois. The company's revenues totaled more than $7 billion in 2023. , ComEd has interconnections with We Energies, ITC Midwest, Ameren, American Electric Power, Northern Indiana Public Service, and MidAmerican Energy (MEC). History Founding The earliest predecessor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Pennsylvania Railroad
The Pennsylvania Railroad ( reporting mark PRR), legal name as the Pennsylvania Railroad Company, also known as the "Pennsy," was an American Class I railroad that was established in 1846 and headquartered in Philadelphia, Pennsylvania. At its peak in 1882, the Pennsylvania Railroad was the largest railroad (by traffic and revenue), the largest transportation enterprise, and the largest corporation in the world. Over its existence, Pennsylvania Railroad acquired, merged with, or owned part of at least 800 other rail lines and companies. At the end of 1926, it operated of rail line;This mileage includes companies independently operated. PRR miles of all tracks, which includes first (or main), second, third, fourth, and sidings, totalled 28,040.49 at the end of 1926. in the 1920s, it carried nearly three times the traffic as other railroads of comparable length, such as the Union Pacific and Atchison, Topeka & Santa Fe railroads. Its only formidable rival was the New York Centra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Purdue University
Purdue University is a Public university#United States, public Land-grant university, land-grant research university in West Lafayette, Indiana, United States, and the flagship campus of the Purdue University system. The university was founded in 1869 after Lafayette, Indiana, Lafayette businessman John Purdue donated land and money to establish a college of science, technology, and agriculture; the first classes were held on September 16, 1874. Purdue University is a member of the Association of American Universities and is Carnegie Classification of Institutions of Higher Education, classified among "R1: Doctoral Universities – Very high research activity". Purdue enrolls the largest student body of any individual university campus in Indiana, as well as the ninth-largest foreign student population of any university in the United States. The university is home to the oldest computer science Purdue University Department of Computer Science, program in the United States. Pur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Yokogawa Electric
is a Japanese multinational electrical engineering and software company, with businesses based on its measurement, control, and information technologies. It has a global workforce of over 19,000 employees, 84 subsidiary and 3 affiliated companies operating in 55 countries. The company is listed on the Tokyo Stock Exchange and is a constituent of the Nikkei 225 stock index. Yokogawa pioneered the development of distributed control systems and introduced its Centum series DCS in 1975. Some of Yokogawa's most recognizable products are production control systems, test and measurement instruments, pressure transmitters, flow meters, oxygen analyzers, fieldbus instruments, manufacturing execution systems and advanced process control. History Yokogawa traces its roots back to 1915, when Dr. Tamisuke Yokogawa, a renowned architect, established an electric meter research institute in Shibuya, Tokyo. After pioneering the development and production of electric meters in Japan, this ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Franklin Institute
The Franklin Institute is a science museum and a center of science education and research in Philadelphia, Pennsylvania. It is named after the American scientist and wikt:statesman, statesman Benjamin Franklin. It houses the Benjamin Franklin National Memorial. Founded in 1824, the Franklin Institute is one of the oldest centers of science education and development in the United States. Its chief astronomer is Derrick Pitts. History 19th century On February 5, 1824, Samuel Vaughan Merrick and William H. Keating founded the Franklin Institute of the State of Pennsylvania for the Promotion of the Artes Mechanicae, Mechanic Arts. The opening was chronicled by ''The Literary Chronicle for the Year 1824'': Begun in 1825, the institute was an important force in the professionalization of American science and technology through the nineteenth century, beginning with early investigations into steam engines and water power. In addition to conducting scientific inquiry, it fostered re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Metropolitan Edison Company
FirstEnergy Corp. is an electric utility headquartered in Akron, Ohio. It was established when Ohio Edison merged with Centerior Energy in 1997. Its subsidiaries and affiliates are involved in distributing, transmitting, and generating electricity, energy management, and other energy-related services. Its ten electric utility operating companies comprise one of the United States' largest investor-owned utilities, based on serving 6 million customers within a area of Ohio, Pennsylvania, West Virginia, Virginia, Maryland, New Jersey, and New York. Its generation subsidiaries control more than 16,000 megawatts of capacity. Its distribution lines span over 194,000 miles. In 2018, FirstEnergy ranked 219 on the ''Fortune'' 500 list of the largest public corporations in the United States by revenue. In November 2016, FirstEnergy decided to exit the competitive power business and become a fully regulated company. On July 21, 2020, Speaker of the Ohio House of Representatives, Larr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
